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Question

An infinitely long, straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire



 


A
The rod CD will move upwards parallel to itself
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B
The rod CD will move downward parallel to itself
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C
The rod CD will move upward and turn clockwise at the same time
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D
The rod CD will move upward and turn anti –clockwise at the same time
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Solution

The correct option is A The rod CD will move upward and turn clockwise at the same time
Since the force on the rod CD is non-uniform it will experience force and torque. From the left hand side it can be seen that the force will be upward and torque is clockwise.


Physics

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